Workaround occasional failures of docker system prune in public runners #38825
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Occasionally
docker system prune
fails on Public docker runners withfile resize error: truncate /var/lib/docker/buildkit/containerdmeta.db: read-only file system
This happens after docker has been already cleaned and should have no side efects if the metadata db could not be truncated.
Ignoring error in this case should allow the job to continue.
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